Our expert says:
It's probably related to either circulation or sweating, yes. Or blocked pores that are then affected by sweat. I must confess I haven't heard of it before - perhaps there is a special face-wash that might help, as opposed to just normal washing (which I'm assuming you're doing), before and after running. I suspect it's afterwards that is more important, but as I say, I'm guessing a little. This is more likely a dermatology question, with exercise the catalyst. Hopefully that does help and you can keep running!
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